HT9015 View Datasheet(PDF) - Holtek Semiconductor

Part Name

Description

Manufacturer

HT9015

RF single chip for cordless phone

Holtek Semiconductor 

Preliminary

HT9015

PLL

The figure below shows a simplified block dia-

gram of the programmable universal dual

phase-locked loop (PLL). It provides accurate

channel frequencies for cordless phone.

The PLL contains one 14-bit programmable

counter, one phase detector, charge pump, un-

lock detector and the 2nd local oscillator. The

12-bit programmable counter provides the ref-

erence frequency for the receiver (RX) and

transmitter (TX) loops.

This dual PLL is fully programmable through

the mC serial interface and supports most coun-

try channel frequencies including USA, Spain,

Australia, Korea, New Zealand, U.K., Nether-

lands, France, Taiwan, and China.

V C O _C O N T

VCO 1

VCO 2

R X _O U T

TX _O U T

R X _V C O

C h a rg e

P U M P (R X )

P hase

D e te c to r (R X )

C h a rg e

P U M P (T X )

P hase

D e te c to r (T X )

1 4 - B it R X

C o u n te r

1 2 - B it R E F

C o u n te r

1 4 - B it T X

C o u n te r

LO C A L

LO 2

O s c illa to r

LO 1

D a ta L a tc h

R e g is te r

Figure 9 PLL block diagram

19

April 10, 2000

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